<template>
  <div class="login_container">
    <div class="log_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="~assets/img/logo.png" alt="" />
      </div>
      <!-- 登录表单区 -->
      <!-- 用户名 -->
      <el-form
        lable-width="0px"
        class="login_form"
        :model="loginForm"
        :rules="rules"
        ref="loginRef"
      >
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            v-model="loginForm.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="el-icon-lock"
            v-model="loginForm.password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetInfo">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      //登录表单数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456',
      },
      rules: {
        //验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '长度在 3 到 10 个字符',
            trigger: 'blur',
          },
        ],
        //验证密码是否合法
        password: [
          { required: true, message: '请输入用户密码', trigger: 'change' },
          {
            min: 6,
            max: 12,
            message: '长度在 6 到 12 个字符',
            trigger: 'blur',
            // trigger: "change",
          },
        ],
      },
    }
  },
  methods: {
    resetInfo() {
      // console.log("重置");
      this.$refs.loginRef.resetFields()
    },
    login() {
      // console.log("登录");
      this.$refs.loginRef.validate(async (valid) => {
        if (!valid) return
        // console.log(valid);
        const { data: res } = await this.$http.post('login', this.loginForm)
        //返回的值是promise,可以用await async简化数据,再解构出data数据
        // console.log(res);
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        //1.登录成功之后的token,保存到客户端的sessionStorage中
        //1.1项目中出现了登录之外的其他API接口,必须登录之后才能访问
        //1.2token只应在当前网站打开期间生效,所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        //2.通过编程式导航跳转到后台主页,路由地址是/home
        this.$router.push('/home')
      })
    },
  },
}
</script>

<style Lang="less" scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}
.log_box {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
}
.avatar_box {
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 1px solid #eee;
  box-shadow: 0 0 10px #ddd;
  padding: 10px;
  background-color: #fff;
}
.avatar_box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.login_form {
  position: absolute;
  bottom: 0px;
  width: 100%;
  padding: 0 20px;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>

